I'd take "J" and leave it big, but tilt it and make it a little more sleek and jagged, much like (but not quite like) the Jacksonville Jaguars helmet, and maybe throw a slightly arched State on top of it, or just leave the Dog-head by itself and put State on the front lip of the helmet in small print like we've done before. I wouldn't mind leaving a little detail out as long as it was clearly a Bulldog that looked mean as hell, just to give it some old school flavor like LSU's Tiger logo... but not so it would look like theirs.
I think helmets look best and more classic when they are somewhat plain, but easily recognizable. I mean, we have a friggin' banner on ours now. It's just too much detail. I don't want a giant "M" on our helmets unless there's an "S" and/or a "U" there as well. Gimme the dog-head, the interlocking MSU or the baseball MS. Any of those helmets would be a sharp improvement.